Still 17

Season 1 Episode 4 - Eps 4: The Room Under the Stairs

Gong Woojin is a only individual and he acts as a designer. Due to a injury he experienced 13 years past, he does not need to have a connection with other people. When Woo Seo-Ri was 17, she fell into a coma. 13 years later, she wakes up from her coma. Her mental age is still a 17-year-old, however she is now 30-years-old. Woo Seo-Ri and gong Woojin get involved with one another and fall in love.